Chosen Losses

[Elizazile]

Hi, thank you so much for your detailed response. Your interpretation was pretty much spot on - I was trying to invoke the ending of a relationship that has caused disproportionate pain/stress despite also providing support. However, maybe I could stand to make that a tiny bit more explicit ! Thanks again for the feedback

Hi Elizazile, this is an interesting piece. My interpretations of it may be off. I will give you a basic critique per the forum but I'm mostly going to give you an interpretation of how I'm taking your content so that you can see if it is conveying at least to one reader. Here goes.

We start with the title: Chosen Losses. So this is a loss that the speaker chooses. This is not accidental or fate. It is volitional.

Casting off--Versatile phrase as it also can imply a boat leaving shore. In this case, it means something different but both ideas seem to fit your theme.
The weight that eases my aches--We think a bad partner as an anchor or a weight so the idea of casting off a weight is a chosen loss of sorts. Now what I find interesting is how you've phrased this. Normally casting off the weight, holding no weight, would ease the ache of your muscles. The speaker is saying that they are casting off the very weight that causes them relief. It's taking the idea slightly at a slant.
Setting down
The chair that holds half my weight--I keep thinking that this in reference to lovers when they feel completed by the other and the half isn't a literal measuring of weight but the idea of being torn in half and losing some crucial person (i.e., my better half sort of idea).
Dislocating
The small skylight to my shadowy home;--I take this as a metaphor for the state of mind of the speaker. There is one small aperture that can allow light but they sit in a shadowy home. 
This is the investment I am told I must make--So, this investment is unlikely the opening of a skylight. It's an addition by subtraction investment where they are assured or assure themselves that they are better without this other person.
For less of the same--favorite line. Tight, economical and plays what an investment is going to do. The speaker is at odds with a choice that's supposed to add to their well-being by taking something away.
(Whatever that may mean)--I don't know if the parenthetical aside is necessary--it isn't awful just possibly unneeded.
And for brighter somedays.
Now is where --I think when instead of where
Something like faith kicks in
As, through the gaping hole
My living room begins to fill
With rain
And blustering winds
And the hurricanes that chase--faith even though the world reflects the catastrophic mood.
The rays of light---I love the idea of chase the rays of light
That find me alone--yes 
In my soft old armchair
In the corner.

Lovely poem. I know the comments were a little more than I'd like to give in Basic. I tried to confine most of them though to interpretation and a few to suggestions. I hope some of it helps.

Best,

Todd